Small change to the help interface

bluepymm/main.py

 from bluepymm import prepare_combos, run_combos, select_combos
 
 
-def _print_help():
-    prepare_combos.print_help()
-    print('')
-    run_combos.print_help()
-    print('')
-    select_combos.print_help()
+def print_help(help_mode=None):
+    """Print help"""
+
+    if help_mode == "prepare":
+        prepare_combos.print_help()
+    elif help_mode == "run":
+        run_combos.print_help()
+    elif help_mode == "select":
+        select_combos.print_help()
+    else:
+        print("""Usage:
+
+  bluepymm <command>
+
+Commands:
+  prepare   Prepare combos
+  run       Run combos
+  select    Select combos
+  help      Show help for commands
+""")
+        if help_mode is not None:
+            print("ERROR: Unknown command: %s" % help_mode)
 
 
 def main(arg_list):
     """Main"""
 
-    print('\n##########################################################')
-    print('# Starting BluePyMM: Blue Brain Project Model Management #')
-    print('##########################################################\n')
+    print('\n######################################')
+    print('# Blue Brain Python Model Management #')
+    print('######################################\n')
 
     if arg_list:
         mode = arg_list[0]
@@ -25,10 +41,14 @@ def main(arg_list):
             run_combos.main(arg_list[1:])
         elif mode == "select":
             select_combos.main(arg_list[1:])
-        elif "help" in mode:
-            _print_help()
+        elif mode == "help":
+            try:
+                help_mode = arg_list[1]
+            except IndexError:
+                help_mode = None
+            print_help(help_mode=help_mode)
         else:
-            print('Unknown command {}'.format(mode))
-            print('Known commands are: help, prepare, run, select')
+            print_help()
+            print("ERROR: Unknown command: %s" % mode)
     else:
-        _print_help()
+        print_help()